EP2341728A1 - System and method for controlling communications in a mobile ad-hoc network - Google Patents

System and method for controlling communications in a mobile ad-hoc network Download PDF

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Publication number
EP2341728A1
EP2341728A1 EP10195931A EP10195931A EP2341728A1 EP 2341728 A1 EP2341728 A1 EP 2341728A1 EP 10195931 A EP10195931 A EP 10195931A EP 10195931 A EP10195931 A EP 10195931A EP 2341728 A1 EP2341728 A1 EP 2341728A1
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Prior art keywords
terminals
test
slave
terminal
communication
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EP10195931A
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German (de)
French (fr)
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EP2341728B1 (en
Inventor
Martin Rayrole
M . Antoine Soulie
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Thales SA
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Thales SA
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/06—Testing, supervising or monitoring using simulated traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/34—Selective release of ongoing connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks

Definitions

  • the present invention relates to a system and method for controlling communications within a mobile ad hoc network. It applies in particular during the deployment phase of a new network, when all terminals in this network are located in the same geographical area.
  • the invention is advantageously applicable to networks operating with Ultra High Frequency (UHF) radio frequency bands or even higher frequency bands.
  • UHF Ultra High Frequency
  • Mobile ad hoc networks are networks without infrastructure in which information is exchanged directly between the nodes of the network that combine the functions of transmitter, receiver and relay information.
  • Mobile ad hoc networks known usually operate at low speed which induces a limited number of users, the problem of reducing the convergence time of radio neighborhood discovery algorithms is therefore less present.
  • the present invention particularly aims to control communications within the network in order to limit the number of terminals likely to transmit in the same coverage area defined by the radio range of the system.
  • the invention relates to mobile ad-hoc networks, especially those operating in a UHF radio frequency band "Ultra High Frequency".
  • a large number of terminals are located at a radio hop from each other.
  • Radio hop means the maximum geographical coverage area allowing direct communication by radio link between two terminals.
  • the size of such a zone is defined by the range of the radio link used.
  • a large number of terminals are grouped together in a small geographic area.
  • the convergence time of the radio neighborhood discovery algorithms becomes unmeasurable. Indeed, state-of-the-art protocols used in ad-hoc networks have a theoretical convergence time which increases sharply when the number of terminals increases, and radio interference created by a large number of terminals can make this convergence time infinite.
  • the method according to the invention proposes a method of controlling or orchestrating communications in the event of close proximity of a large number of terminals within a mobile ad hoc network.
  • One of the aims of the invention is to remain compatible with the usual mechanisms of mobile ad-hoc networks while limiting the number of terminals that can transmit at a given instant. This limitation makes it possible to control the number of transmitting terminals and thus to limit the convergence time of the radio neighborhood discovery algorithms.
  • the invention also makes it possible to reduce radio interference that disrupts the operation of these algorithms.
  • each terminal of the mobile ad-hoc network is equipped with an orchestration system that implements the communication control method and in particular the establishment of the close proximity communication mode.
  • an orchestration system that implements the communication control method and in particular the establishment of the close proximity communication mode.
  • two types of terminals are defined as shown schematically in support of figures 1 and 2 .
  • the figure 1 schematizes the architecture of a slave terminal 100 equipped with a slave orchestration system.
  • This terminal 100 comprises at least one radio antenna 104, a mobile ad-hoc communication system 103, a database 102 containing the description of the network and a slave orchestration system 101.
  • the ad-hoc mobile communication system 103 offers, in addition to the basic mechanisms of a mobile ad-hoc system such as a routing or signaling protocol, a radio silent mode. When this mode is activated, the corresponding terminal only functions as a radio receiver. When this mode is disabled, the corresponding terminal operates as both a transmitter and a radio receiver.
  • the database 102 contains the description of the network, in particular the address of all the terminals of the network and the list of communities of interest with the terminals that constitute them.
  • a community of interest or "CDI" is a group of terminals that may have to communicate with each other for a predefined purpose.
  • a community of interest may include terminals wishing to establish regular conference calls; another community of interest may include a set of terminals, coupled with cameras, that want to share their video clips.
  • the slave orchestration system 101 comprises at least the following elements.
  • a test module of the network 111 receives test requests, via the ad-hoc mobile network, and executes them for the purpose of testing the operating state of the network.
  • a database 113 contains the communications that the terminal 100 wishes to establish at a given time. For each of these communications, the database contains an identifier unique for each terminal, the list of destination terminals or the recipient community of interest, the type of link that may be unidirectional or bidirectional, the minimum bandwidth required, the service (eg telephony, messaging, alarm system). .), and the criticality of the communication. For example a strong criticality is defined for a serious alert message, and a low criticality for a message whose content is considered less important.
  • a communications control module 112 sends, upon request, the list of communications that the terminal 100 wishes to establish at a given instant, and establishes or deletes the communications according to the authorizations it receives from the master terminal 200.
  • a module of Administration 114 allows the terminal 100 to enter and exit the close proximity communication mode.
  • the figure 2 schematizes the architecture of a master terminal 200 equipped with a master orchestration system.
  • This terminal 200 comprises at least all the components of a slave terminal 100, because it performs both the master and slave function.
  • This terminal 200 thus comprises a slave orchestration system 101, a network description database 202, a mobile ad-hoc communication system 203 and a radio antenna 204. Moreover, it also includes a master orchestration system. 201 which contains the following elements.
  • a network test module 211 sends test requests to a plurality of slave terminals via the mobile ad-hoc network.
  • a communications control module 212 collects the communication requirements within the network, and transmits to the slave terminals the list of communications that they are allowed to establish.
  • a database 213 contains all the communication needs on the entire network. Its content corresponds to the aggregation of databases 113 of communications to be established for all slave terminals. For each call to be established, the calling terminal is also memorized as well as the time to which communication was initially requested by the slave terminal 100.
  • a database 215 contains the list of all communications currently in progress in the network. For each of these communications, the database 215 contains the same parameters as those of the communication requirements database 213, as well as the time of establishment of each communication.
  • a base of rules 216 expressed as predicates. These rules make it possible to choose among communications requirements which communications can be established and which communications already established should be interrupted.
  • the rule base 216 receives as input all the data contained in the databases 213 containing all the communication needs and 215 containing the list of all the communications in progress in the network, as well as the maximum number of terminals. can simultaneously transmit in the same radio hop. From these data, the rules make it possible to assign an order of priority between the communications to be established or those already established. This order of priority is then used to authorize or deny each of the communications to be established or already established. Finally, by comparing this "authorized / refused" marking and the list of already established communications, the rules determine the list of new communications to be established, and the list of already established communications that must be interrupted.
  • the rule base 216 contains the following rules.
  • a communication for the telephony service is of medium priority and is established for a predefined duration, then this communication must switch to a low priority.
  • each terminal transmitting a call to be established is also transmitting one or more calls already established, then the priority of the call to be established is increased by one level.
  • a decision engine 214 receives as input data the databases of the communication requirements 213 and the current communications 215, as well as the base of the rules 216. At the output, the decision engine 214 supplies the control module 212 with communications the list of current calls to be interrupted and the list of calls to be made.
  • an administration module 217 makes it possible to enter and exit the close proximity communication mode.
  • the following operations are performed during an initialization phase of the master and slave orchestration systems.
  • the network description is broadcast on all terminals. This broadcast can be performed, for example, using a physical memory medium inserted in each terminal 100,200.
  • a parameter of configuration, present in each terminal 100,200 indicates if this terminal is only "slave” or is also "master”. This parameter is set to "slave” by default. This value is modified, via the terminal user interface, to the value "master" for one and only one terminal of the network chosen randomly.
  • N max the maximum number of terminals capable of transmitting in the same radio hop at a given instant.
  • N max the maximum number of terminals capable of transmitting in the same radio hop at a given instant. Its value is defined according to the constraints of the system and the support waveform of the network.
  • test sample is stored on the master terminal 200 during the installation of the service. For example, a few seconds of speech for the telephony service, a text for the messaging service, etc.
  • This sample of the data to be transmitted is used by the network test module 111, 211 according to the procedure described below, in the purpose of determining the operational status of each service.
  • the entry into "close proximity” communication mode is notably performed at the start of the network.
  • the master terminal 200 starts with the “strong proximity” communication mode enabled and the “silent radio” mode deactivated. All other terminals start with the "strong proximity” communication mode enabled and the "radio silence” mode activated.
  • the entry into "close proximity” communication mode can also be performed while the network is already operational. This case occurs for example when a large number of terminals, previously spread over an extended geographical area, are grouped in a restricted geographical area equivalent to the same radio hop. In that case, the entry into "close proximity” communication mode is performed by the administration module 114,217.
  • the databases of the communication requirements 213 and the ongoing communications 215 are purged, i.e., their contents are erased.
  • the network test modules 211 and the communication control 212 of the terminal are activated.
  • the radio silence mode of the mobile ad-hoc communication system 203 of the master terminal 200 is deactivated.
  • the administration module 217 of the master terminal 200 broadcasts to all the terminals of the network a communication notification in "close proximity" communication mode.
  • the database of the communications to be established 113 is purged.
  • the network test modules 111 and communication control 114 of the terminal are activated.
  • the radio silence mode of the mobile ad-hoc communication system 103 of the master terminal 200 is activated.
  • the network test module 111, 211 makes it possible to know the operating state of the network at a given instant.
  • This network test is orchestrated by the master terminal 200 so as to limit the number of terminals that can transmit at a given instant.
  • the method according to the invention successively processes each community of interest present in the network description database 202 and each service supported by each community of interest, by performing at least the operations described below.
  • test groups are automatically constituted in the following manner.
  • An N1 terminal is randomly selected among the terminals declared in the community of interest.
  • the other terminals declared in the community of interest are distributed, randomly, into test groups comprising (N max -1) terminals. If the number of these terminals is not divisible by (N max -1), the last test group will contain a number of terminals less than (N max -1).
  • the terminal N1 is added to each test group thus created. This N1 terminal is therefore part of all the test groups for the community of interest and the service concerned by the test. Thus, the intersection between all the test groups is non-empty, which makes it possible to ensure complete coverage of the procedure according to the network test invention.
  • test group is identical to the community of interest.
  • a test of the network is carried out for each test group by considering them one after the other, as follows.
  • a test request message with as recipients all the terminals of the test group is sent by the network test module 211 of the master terminal 200.
  • This request contains a sample corresponding to the service to be tested and a timeout value. This delay value is automatically calculated according to the waveform, the number of terminals in the test group, and the size or duration of the test sample.
  • the network test module 211 of the master terminal 200 then waits for the reception of all the test reports from each of the terminals of the test group. This wait is limited by the value of the time delay T temp added to the maximum duration D max of transmission of all the test reports.
  • the network test module 211 stores all the test reports received from the slave terminals. When all the communities of interest and the services have been tested, the network test module 211 sends the user of the master terminal 200 a summary of the network test results. This summary contains, for each community of interest and each service supported by it, the list of terminals that appear in the test reports, that is to say, the terminals for which no acknowledgment has been received. .
  • the address of the terminal that sent the test request message is stored by the administration module as the address of the master terminal 200.
  • the mobile ad-hoc communication system 103 of the slave terminal 100 exits the radio silence mode.
  • the slave terminal 100 broadcasts to the community of interest the test sample received, previously transmitted by the master terminal 200.
  • the wait can be shortened when the terminal has received an acknowledgment from all other terminals of the request for test, and it has itself sent an acknowledgment to all these terminals.
  • test report containing the list of destination terminals of the test request for which no acknowledgment has been received.
  • the mobile ad-hoc communication system 103 of the slave terminal 100 reactivates the radio silence mode.
  • the communications control module 112, 212 makes it possible to establish communications between terminals.
  • the master terminal 200 begins by registering the communication requirements within the network by interrogating each slave terminal 100 and then authorizing the establishment of a selected set of communications. These operations are described below.
  • the communications database to be established 113 is updated with each new communication request or with each deletion of a previous request. These requests and deletions are required, for example, by the user of the slave terminal 100 via the user interface, or by an external system via a computer interface.
  • the communications control module 212 of the master terminal 200 successively interrogates each slave terminal 100 about its communication needs and stores the responses in the communication requirements database 213.
  • each slave terminal 100 On each slave terminal 100, the following procedure is executed upon receipt of a request for its communication requirements.
  • the mobile ad-hoc communication system 103 of the slave terminal 100 deactivates the radio silence mode.
  • the slave terminal 100 responds to the request by sending the contents of the communications database to be established 113.
  • the mobile ad-hoc communication system 103 of the terminal reactivates the radio silence mode.
  • each slave terminal 100 On each slave terminal 100, the following procedure is executed on receipt of an authorization notification for a new communication.
  • the new authorized communication is deleted from the communications database to be established 113.
  • the mobile ad-hoc communication system 103 of the terminal deactivates the radio silence mode.
  • the slave terminal 100 establishes the communication.
  • each destination terminal upon reception of end of communication, requests its mobile ad-hoc communication system to reactivate the radio silence mode unless the terminal has other communications in progress, and unless the terminal is also the master terminal 200.
  • the communication control module 112 of the slave terminal 100 notifies the master terminal 200 of the end of the call by referring to the unique identifier corresponding to this communication.
  • the communications control module 112 requests the mobile ad-hoc communication system 103 of the terminal to reactivate the silent mode radio.
  • the slave terminal 100 interrupts the communication.
  • each destination terminal on receipt of end of communication, request its mobile ad-hoc communication system 103 to disable the silent radio mode unless the terminal has other communications in progress, and unless the terminal is also the master terminal 200.
  • the mobile ad-hoc communication system 103 of the terminal reactivates the radio silence mode.
  • the administration module 114,217 makes it possible to leave the close proximity communication mode.
  • the network test modules 211 and the communication control 212 of the terminal are deactivated.
  • the databases of the communication requirements 213 and the communications in progress 215 are purged.
  • the administration module 217 of the master terminal 200 broadcasts to all the terminals of the network an exit notification of the close proximity communication mode.
  • the network test modules 11 and the communication control 112 of the terminal are deactivated.
  • the database of the communications to be established 113 is purged.
  • the mobile ad-hoc communication system 103 of the terminal deactivates the radio silence mode.

Abstract

The method involves transmitting and receiving data using a mobile ad-hoc communication system. The authorized communication between slave terminals of a mobile ad-hoc network, is defined by a master orchestration system (201) of a master terminal (200) according to hierarchy rules. The authorization to establish the communication or the necessity to interrupt the previously established communication, is notified to a slave orchestration system (101) of the slave terminals. The rules are established according to criterion e.g. communication criterion.

Description

La présente invention concerne un système et un procédé de contrôle des communications au sein d'un réseau ad hoc mobile. Elle s'applique notamment pendant la phase de déploiement d'un nouveau réseau, lorsque tous les terminaux composant ce réseau sont situés dans la même zone géographique. L'invention s'applique avantageusement à des réseaux fonctionnant avec des bandes de fréquences radio UHF (« Ultra High Frequency ») ou des bandes de fréquences encore plus élevées.The present invention relates to a system and method for controlling communications within a mobile ad hoc network. It applies in particular during the deployment phase of a new network, when all terminals in this network are located in the same geographical area. The invention is advantageously applicable to networks operating with Ultra High Frequency (UHF) radio frequency bands or even higher frequency bands.

Les réseaux ad hoc mobiles sont des réseaux sans infrastructure dans lesquels les informations sont échangées directement entre les noeuds du réseau qui cumulent à la fois les fonctions d'émetteur, de récepteur et de relais de l'information.Mobile ad hoc networks are networks without infrastructure in which information is exchanged directly between the nodes of the network that combine the functions of transmitter, receiver and relay information.

Lorsqu'un nombre important de terminaux sont à portée radio les uns des autres, les communications peuvent être impossibles du fait d'interférences radio générées par un nombre important d'utilisateurs et également du temps de convergence non prédictible des algorithmes de découverte du voisinage radio.When a large number of terminals are within radio range of each other, communications may be impossible due to radio interference generated by a large number of users and also the unpredictable convergence time of radio neighborhood discovery algorithms. .

Les réseaux ad hoc mobiles connus fonctionnent le plus souvent à faible débit ce qui induit un nombre d'utilisateurs limité, la problématique de réduction du temps de convergence des algorithmes de découverte du voisinage radio est donc moins présente.Mobile ad hoc networks known usually operate at low speed which induces a limited number of users, the problem of reducing the convergence time of radio neighborhood discovery algorithms is therefore less present.

La présente invention a notamment pour objectif le contrôle des communications au sein du réseau afin de limiter le nombre de terminaux susceptibles d'émettre dans une même zone de couverture définie par la portée radio du système.The present invention particularly aims to control communications within the network in order to limit the number of terminals likely to transmit in the same coverage area defined by the radio range of the system.

A cet effet l'invention a pour objet un système de contrôle des communications au sein d'un réseau ad hoc mobile comportant une pluralité de terminaux caractérisé en ce que :

  • o chacun desdits terminaux comporte au moins une antenne radio, un système de communication ad-hoc mobile adapté à émettre et recevoir des données, une base de données de description du réseau qui contient au moins l'adresse de tous les terminaux du réseau et la liste des communautés d'intérêts qui regroupent l'ensemble des terminaux susceptibles de devoir communiquer entre eux, lesdits terminaux comportant en plus un système d'orchestration esclave,
  • o au moins un desdits terminaux possède en outre la fonction maitre, lesdits terminaux maitre comportant en outre un système d'orchestration maitre,
  • o ledit système d'orchestration esclave comportant au moins un module de test du réseau, un module de contrôle des communications, une base de données des communications à établir et un module d'administration,
  • o ledit système d'orchestration maitre comportant au moins un module de test du réseau, un module de contrôle des communications, une base de données des besoins de communication, un moteur de décision, une base de donnée des communications en cours, une base de règles de hiérarchisation des communications et un module d'administration,
  • o ledit système d'orchestration maitre étant adapté à définir quelles communications entre les terminaux esclave sont autorisées en fonction desdites règles de hiérarchisation et à notifier les systèmes d'orchestration esclave des terminaux esclaves de leur autorisation à établir une communication ou de la nécessité d'interrompre une communication préalablement établie, lesdites règles de hiérarchisation étant établies en fonction d'au moins un
  • des critères suivants: criticité de la communication, durée maximum Dmax de la communication, nombre maximum de terminaux pouvant émettre simultanément, bande passante disponible.
To this end, the subject of the invention is a system for controlling communications within a mobile ad hoc network comprising a plurality of terminals, characterized in that:
  • each of said terminals comprises at least one radio antenna, a mobile ad-hoc communication system adapted to transmit and receive data, a network description database which contains at least the address of all the terminals of the network and the list of the communities of interest which group together all the terminals likely to have to communicate with each other, said terminals including in addition a slave orchestration system,
  • at least one of said terminals also has the master function, said master terminals further comprising a master orchestration system,
  • said slave orchestration system comprising at least one network test module, a communications control module, a communications database to be established and an administration module,
  • o said master orchestration system comprising at least one network test module, a communications control module, a communication requirements database, a decision engine, a communications database in progress, a database of communication prioritization rules and an administration module,
  • said master orchestration system being adapted to define which communications between the slave terminals are authorized according to said hierarchization rules and to notify the slave orchestration systems of the slave terminals of their authorization to establish a communication or the need for interrupt a previously established communication, said prioritization rules being established according to at least one
  • the following criteria: criticality of the communication, maximum duration D max of the communication, maximum number of terminals that can transmit simultaneously, available bandwidth.

Dans une variante de réalisation de l'invention, le module de test du réseau est adapté à exécuter, à un instant donné, une étape de test consistant au moins à :

  • o décomposer ladite communauté d'intérêt en un nombre de groupes de tests au moins égal à un, chacun desdits groupes de tests comportant au plus un nombre de terminaux égal au nombre maximum de terminaux autorisés à communiquer simultanément, l'intersection entre tous les groupes de tests étant non vide,
  • o envoyer depuis le terminal maitre vers tous les terminaux esclaves dudit groupe de test un message de demande de test contenant un échantillon du service à tester et une valeur de temporisation Ttemp,
  • o envoyer depuis chaque terminal esclave, sur réception dudit message de demande de test, ledit échantillon de test à tous les terminaux de la communauté d'intérêt,
  • o envoyer depuis chaque terminal esclave dudit groupe de test, sur réception d'un échantillon de test, un message d'acquittement au terminal esclave émetteur dudit échantillon de test,
  • o envoyer depuis chaque terminal esclave dudit groupe de test vers le terminal maitre, avant l'expiration de la temporisation Ttemp, un compte rendu de test contenant la liste des terminaux destinataires de l'échantillon de test pour lesquels aucun acquittement n'a été reçu.
In an alternative embodiment of the invention, the network test module is adapted to perform, at a given moment, a test step consisting of at least:
  • decomposing said community of interest into a number of test groups at least equal to one, each of said test groups comprising at most a number of terminals equal to the maximum number of terminals authorized to communicate simultaneously, the intersection between all the groups of tests being non-empty,
  • sending from the master terminal to all the slave terminals of said test group a test request message containing a sample of the service to be tested and a time delay value T temp ,
  • sending from said slave terminal, on receipt of said test request message, said test sample to all the terminals of the community of interest,
  • sending from each slave terminal of said test group, on receipt of a test sample, an acknowledgment message to the slave terminal transmitting said test sample,
  • o send from each slave terminal of said test group to the master terminal, before expiry of the timer T time , a test report containing the list of the destination terminals of the test sample for which no acknowledgment has been received.

L'invention a également pour objet un procédé de contrôle des communications au sein d'un réseau ad hoc mobile comportant une pluralité de terminaux ayant la fonction esclave, lesdits terminaux comportant en outre un système d'orchestration esclave, au moins un desdits terminaux possédant en outre la fonction maitre, ledit terminal maître comportant en outre un système d'orchestration maître, ledit procédé étant caractérisé en ce qu'il comporte au moins

  • o Une étape de détermination de quelles communications entre les terminaux esclave sont autorisées en fonction de règles de hiérarchisation établies en fonction d'au moins un des critères suivants: criticité de la communication, durée maximum Dmax de la communication, nombre maximum de terminaux pouvant émettre simultanément, bande passante disponible,
  • o Une étape de notification aux systèmes d'orchestration esclave des terminaux esclaves de leur autorisation à établir une communication ou de la nécessité d'interrompre une communication préalablement établie.
The invention also relates to a method of controlling communications within a mobile ad hoc network comprising a plurality of terminals having the slave function, said terminals further comprising a slave orchestration system, at least one of said terminals. further having the master function, said master terminal further comprising a master orchestration system, said method being characterized in that it comprises at least
  • o A step of determining which communications between the slave terminals are authorized according to the prioritization rules established according to at least one of the following criteria: criticality of the communication, maximum duration D max of the communication, maximum number of terminals able to transmit simultaneously, available bandwidth,
  • o A step of notification to the slave orchestration systems of the slave terminals of their authorization to establish a call or the need to interrupt a previously established call.

Dans une variante de réalisation le procédé selon l'invention comporte en outre une étape de test, à un instant donné, des communications pour toutes les communautés d'intérêt qui regroupent l'ensemble des terminaux susceptibles de devoir communiquer entre eux, ladite étape de test consistant au moins à :

  • o décomposer ladite communauté d'intérêt en un nombre de groupes de tests au moins égal à un, chacun desdits groupes de tests comportant au plus un nombre de terminaux égal au nombre maximum de terminaux autorisés à communiquer simultanément, l'intersection entre tous les groupes de tests étant non vide,
  • o envoyer depuis le terminal maitre vers tous les terminaux esclaves dudit groupe de test un message de demande de test contenant un échantillon du service à tester et une valeur de temporisation Ttemp,
  • o envoyer depuis chaque terminal esclave, sur réception dudit message de demande de test, ledit échantillon de test à tous les terminaux de la communauté d'intérêt,
  • o envoyer depuis chaque terminal esclave dudit groupe de test, sur réception d'un échantillon de test, un message d'acquittement au terminal esclave émetteur dudit échantillon de test,
  • o envoyer depuis chaque terminal esclave dudit groupe de test vers le terminal maitre, avant l'expiration de la temporisation Ttemp, un compte rendu de test contenant la liste des terminaux destinataires de l'échantillon de test pour lesquels aucun acquittement n'a été reçu.
In an alternative embodiment, the method according to the invention also comprises a step of testing, at a given instant, communications for all the communities of interest which group together all the terminals likely to have to communicate with each other, said step of test consisting of at least:
  • decomposing said community of interest into a number of test groups at least equal to one, each of said test groups comprising at most a number of terminals equal to the maximum number of terminals authorized to communicate simultaneously, the intersection between all the groups of tests being non-empty,
  • sending from the master terminal to all the slave terminals of said test group a test request message containing a sample of the service to be tested and a time delay value T temp ,
  • sending from said slave terminal, on receipt of said test request message, said test sample to all the terminals of the community of interest,
  • sending from each slave terminal of said test group, on receipt of a test sample, an acknowledgment message to the slave terminal transmitting said test sample,
  • o send from each slave terminal of said test group to the master terminal, before expiry of the timer T time , a test report containing the list of the destination terminals of the test sample for which no acknowledgment has been received.

D'autres caractéristiques apparaîtront à la lecture de la description détaillée donnée à titre d'exemple et non limitative qui suit faite en regard de dessins annexés qui représentent :

  • La figure 1, un synoptique de l'architecture d'un terminal esclave mettant en oeuvre le procédé selon l'invention,
  • La figure 2, un synoptique de l'architecture d'un terminal maitre mettant en oeuvre le procédé selon l'invention.
Other characteristics will become apparent on reading the detailed description given by way of nonlimiting example, which follows, with reference to appended drawings which represent:
  • The figure 1 , a block diagram of the architecture of a slave terminal implementing the method according to the invention,
  • The figure 2 , a block diagram of the architecture of a master terminal implementing the method according to the invention.

L'invention concerne les réseaux ad-hoc mobiles, notamment ceux fonctionnant dans une bande de fréquence radio UHF « Ultra High Frequency ». Dans un tel réseau, il est fréquent qu'un nombre important de terminaux soient situés à un bond radio les uns des autres. Par bond radio on entend la zone de couverture géographique maximale permettant de communiquer directement par liaison radio entre deux terminaux. La dimension d'une telle zone est définie par la portée de la liaison radio utilisée. En particulier, lors du déploiement d'un nouveau réseau ad-hoc, un grand nombre de terminaux sont regroupés dans une zone géographique réduite. Lorsque le réseau est établi, une telle configuration peut également apparaitre lorsqu'un grand nombre de terminaux se regroupent dans une zone limitée. Dans de telles circonstances, le temps de convergence des algorithmes de découverte du voisinage radio devient non maitrisable. En effet, les protocoles de l'état de l'art utilisés dans les réseaux ad-hoc ont un temps de convergence théorique qui s'accroit fortement lorsque le nombre de terminaux augmente, et les interférences radio créées par un nombre important de terminaux peuvent rendre ce temps de convergence infini.The invention relates to mobile ad-hoc networks, especially those operating in a UHF radio frequency band "Ultra High Frequency". In such a network, it is common that a large number of terminals are located at a radio hop from each other. Radio hop means the maximum geographical coverage area allowing direct communication by radio link between two terminals. The size of such a zone is defined by the range of the radio link used. In particular, when deploying a new ad-hoc network, a large number of terminals are grouped together in a small geographic area. When the network is established, such a configuration can also appear when a large number of terminals are grouped in a limited area. In such circumstances, the convergence time of the radio neighborhood discovery algorithms becomes unmeasurable. Indeed, state-of-the-art protocols used in ad-hoc networks have a theoretical convergence time which increases sharply when the number of terminals increases, and radio interference created by a large number of terminals can make this convergence time infinite.

Le procédé selon l'invention propose une méthode de contrôle, ou d'orchestration des communications en cas de forte proximité d'un grand nombre de terminaux au sein d'un réseau ad hoc mobile. Un des buts de l'invention est de rester compatible des mécanismes usuels des réseaux ad-hoc mobiles tout en limitant le nombre de terminaux pouvant émettre à un instant donné. Cette limitation permet de maitriser le nombre de terminaux émetteurs et donc de borner le temps de convergence des algorithmes de découverte du voisinage radio. L'invention permet également de réduire les interférences radio qui perturbent le fonctionnement de ces algorithmes.The method according to the invention proposes a method of controlling or orchestrating communications in the event of close proximity of a large number of terminals within a mobile ad hoc network. One of the aims of the invention is to remain compatible with the usual mechanisms of mobile ad-hoc networks while limiting the number of terminals that can transmit at a given instant. This limitation makes it possible to control the number of transmitting terminals and thus to limit the convergence time of the radio neighborhood discovery algorithms. The invention also makes it possible to reduce radio interference that disrupts the operation of these algorithms.

A cet effet, le procédé selon l'invention comprend au moins les étapes suivantes :

  • une étape d'entrée en mode de communication « forte proximité », qui peut être faite au moment de l'établissement du réseau, ou lorsque le réseau est déjà en fonctionnement.
  • une étape de test du réseau qui permet de connaitre l'état de fonctionnement du réseau.
  • une étape de communication directe entre terminaux qui permet l'utilisation du réseau alors que les terminaux sont regroupés dans une zone géographique réduite.
  • une étape de sortie du mode de communication « forte proximité » qui est activée lorsqu'un nombre important de terminaux, jusqu'alors présents dans un même bond radio se dispersent sur une zone géographique étendue.
For this purpose, the method according to the invention comprises at least the following steps:
  • a step of entry into "close proximity" communication mode, which can be done at the time of establishment of the network, or when the network is already in operation.
  • a network test step which makes it possible to know the operating state of the network.
  • a step of direct communication between terminals that allows the use of the network while the terminals are grouped in a small geographical area.
  • an output step of the "close proximity" communication mode that is activated when a large number of terminals, hitherto present in the same radio hop, disperse over an extended geographic area.

Pour mettre en ouvre le procédé selon l'invention, chaque terminal du réseau ad-hoc mobile est équipé d'un système d'orchestration qui implémente le procédé de contrôle des communications et notamment l'établissement du mode de communication forte proximité. On parle de forte proximité pour désigner un scénario pour lequel un très grand nombre de terminaux sont tous situés dans un même bond radio.To implement the method according to the invention, each terminal of the mobile ad-hoc network is equipped with an orchestration system that implements the communication control method and in particular the establishment of the close proximity communication mode. We talk about strong proximity to designate a scenario for which a very large number of terminals are all located in the same radio hop.

Pour cela, deux types de terminaux sont définis tels que schématisés à l'appui des figures 1 et 2.For this purpose, two types of terminals are defined as shown schematically in support of figures 1 and 2 .

La figure 1 schématise l'architecture d'un terminal 100 esclave équipé d'un système d'orchestration esclave. Ce terminal 100 comprend au moins une antenne radio 104, un système de communication ad-hoc mobile 103, une base de données 102 contenant la description du réseau et un système d'orchestration esclave 101.The figure 1 schematizes the architecture of a slave terminal 100 equipped with a slave orchestration system. This terminal 100 comprises at least one radio antenna 104, a mobile ad-hoc communication system 103, a database 102 containing the description of the network and a slave orchestration system 101.

Le système de communication ad-hoc mobile 103 offre, outre les mécanismes de base d'un système ad-hoc mobile tels qu'un protocole de routage ou de signalisation, un mode silence radio. Lorsque ce mode est activé, le terminal correspondant fonctionne uniquement en récepteur radio. Lorsque ce mode est désactivé, le terminal correspondant fonctionne à la fois en émetteur et récepteur radio.The ad-hoc mobile communication system 103 offers, in addition to the basic mechanisms of a mobile ad-hoc system such as a routing or signaling protocol, a radio silent mode. When this mode is activated, the corresponding terminal only functions as a radio receiver. When this mode is disabled, the corresponding terminal operates as both a transmitter and a radio receiver.

La base de données 102 contient la description du réseau, en particulier l'adresse de tous les terminaux du réseau et la liste des communautés d'intérêt avec les terminaux qui les constituent. Une communauté d'intérêt ou « CDI » est un regroupement de terminaux susceptibles de devoir communiquer entre eux dans un but prédéfini. Par exemple une communauté d'intérêt peut regrouper des terminaux souhaitant établir régulièrement des conférences téléphoniques; une autre communauté d'intérêt peut regrouper un ensemble de terminaux, couplés à des caméras, qui souhaitent partager leurs séquences vidéo.The database 102 contains the description of the network, in particular the address of all the terminals of the network and the list of communities of interest with the terminals that constitute them. A community of interest or "CDI" is a group of terminals that may have to communicate with each other for a predefined purpose. For example, a community of interest may include terminals wishing to establish regular conference calls; another community of interest may include a set of terminals, coupled with cameras, that want to share their video clips.

Le système d'orchestration esclave 101 comprend au moins les éléments suivants. Un module de test du réseau 111 reçoit des demandes de test, via le réseau ad-hoc mobile, et les exécute dans le but de tester l'état de fonctionnement du réseau. Une base de données 113 contient les communications que le terminal 100 souhaite établir à un instant donné. Pour chacune de ces communications, la base de données contient un identifiant unique pour chaque terminal, la liste des terminaux destinataires ou la communauté d'intérêt destinataire, le type de liaison qui peut être unidirectionnelle ou bidirectionnelle, la bande passante minimale nécessaire, le service (par exemple téléphonie, messagerie, système d'alarme...), et la criticité de la communication. Par exemple une criticité forte est définie pour un message d'alerte grave, et une criticité faible pour un message dont le contenu est jugé moins important. Un module de contrôle des communications 112 envoie, sur demande, la liste des communications que le terminal 100 souhaite établir à un instant donné, et établit ou supprime les communications en fonction des autorisations qu'il reçoit du terminal maître 200. Un module d'administration 114 permet au terminal 100 d'entrer et de sortir du mode de communication forte proximité.The slave orchestration system 101 comprises at least the following elements. A test module of the network 111 receives test requests, via the ad-hoc mobile network, and executes them for the purpose of testing the operating state of the network. A database 113 contains the communications that the terminal 100 wishes to establish at a given time. For each of these communications, the database contains an identifier unique for each terminal, the list of destination terminals or the recipient community of interest, the type of link that may be unidirectional or bidirectional, the minimum bandwidth required, the service (eg telephony, messaging, alarm system). .), and the criticality of the communication. For example a strong criticality is defined for a serious alert message, and a low criticality for a message whose content is considered less important. A communications control module 112 sends, upon request, the list of communications that the terminal 100 wishes to establish at a given instant, and establishes or deletes the communications according to the authorizations it receives from the master terminal 200. A module of Administration 114 allows the terminal 100 to enter and exit the close proximity communication mode.

La figure 2 schématise l'architecture d'un terminal maitre 200 équipé d'un système d'orchestration maitre. Ce terminal 200 comprend au moins tous les composants d'un terminal esclave 100, car il exécute à la fois la fonction de maitre et d'esclave. Ce terminal 200 comprend donc un système d'orchestration esclave 101, une base de données de description du réseau 202, un système de communication ad-hoc mobile 203 et une antenne radio 204. De plus, il inclue également un système d'orchestration maitre 201 qui comporte les éléments suivants.The figure 2 schematizes the architecture of a master terminal 200 equipped with a master orchestration system. This terminal 200 comprises at least all the components of a slave terminal 100, because it performs both the master and slave function. This terminal 200 thus comprises a slave orchestration system 101, a network description database 202, a mobile ad-hoc communication system 203 and a radio antenna 204. Moreover, it also includes a master orchestration system. 201 which contains the following elements.

Un module de test réseau 211 envoie des demandes de test à une pluralité de terminaux esclaves, via le réseau ad-hoc mobile.A network test module 211 sends test requests to a plurality of slave terminals via the mobile ad-hoc network.

Un module 212 de contrôle des communications collecte les besoins de communications au sein du réseau, et transmet aux terminaux esclaves la liste des communications qu'ils sont autorisés à établir.A communications control module 212 collects the communication requirements within the network, and transmits to the slave terminals the list of communications that they are allowed to establish.

Une base de données 213 contient l'ensemble des besoins de communications sur l'ensemble du réseau. Son contenu correspond à l'agrégation des bases de données 113 des communications à établir pour tous les terminaux esclaves. Pour chaque communication à établir, le terminal demandeur est également mémorisé de même que l'heure à laquelle la communication a été initialement demandée par le terminal esclave 100.A database 213 contains all the communication needs on the entire network. Its content corresponds to the aggregation of databases 113 of communications to be established for all slave terminals. For each call to be established, the calling terminal is also memorized as well as the time to which communication was initially requested by the slave terminal 100.

Une base de données 215 contient la liste de toutes les communications actuellement en cours dans le réseau. Pour chacune de ces communications, la base de données 215 contient les mêmes paramètres que ceux de la base de données 213 des besoins de communications, ainsi que l'heure d'établissement de chaque communication.A database 215 contains the list of all communications currently in progress in the network. For each of these communications, the database 215 contains the same parameters as those of the communication requirements database 213, as well as the time of establishment of each communication.

Une base de règles 216 exprimées sous forme de prédicats. Ces règles permettent de choisir, parmi les besoins de communications, quelles communications pourront être établies, et quelles communications déjà établies devront être interrompues. La base de règles 216 reçoit en entrée l'ensemble des données contenues dans les bases de données 213 contenant l'ensemble des besoins de communications et 215 contenant la liste de toutes les communications en cours dans le réseau, ainsi que le nombre maximal de terminaux pouvant émettre simultanément dans un même bond radio. A partir de ces données, les règles permettent d'affecter un ordre de priorité entre les communications à établir ou celles déjà établies. Cet ordre de priorité est ensuite utilisé pour autoriser ou refuser chacune des communications à établir ou déjà établies. Enfin, en comparant ce marquage « autorisé / refusé » et la liste des communications déjà établies, les règles déterminent la liste des nouvelles communications à établir, et la liste des communications déjà établies qu'il faut interrompre.A base of rules 216 expressed as predicates. These rules make it possible to choose among communications requirements which communications can be established and which communications already established should be interrupted. The rule base 216 receives as input all the data contained in the databases 213 containing all the communication needs and 215 containing the list of all the communications in progress in the network, as well as the maximum number of terminals. can simultaneously transmit in the same radio hop. From these data, the rules make it possible to assign an order of priority between the communications to be established or those already established. This order of priority is then used to authorize or deny each of the communications to be established or already established. Finally, by comparing this "authorized / refused" marking and the list of already established communications, the rules determine the list of new communications to be established, and the list of already established communications that must be interrupted.

A titre d'exemple, la base de règles 216 contient les règles suivantes.For example, the rule base 216 contains the following rules.

Si une communication pour le service téléphonie est de priorité moyenne et qu'elle est établie depuis une durée prédéfinie, alors cette communication doit basculer à une priorité faible.If a communication for the telephony service is of medium priority and is established for a predefined duration, then this communication must switch to a low priority.

Si une communication est de criticité forte, alors sa priorité est haute.If a communication is of high criticality, then its priority is high.

Si chaque terminal émetteur d'une communication à établir est également émetteur d'une ou plusieurs communications déjà établies, alors la priorité de la communication à établir est augmentée d'un niveau.If each terminal transmitting a call to be established is also transmitting one or more calls already established, then the priority of the call to be established is increased by one level.

Si une communication "A" non établie et sans marquage, c'est à dire ni autorisée ni refusée, est plus prioritaire qu'une communication "B" déjà établie, alors la communication "A" doit être marquée comme autorisée.If an "A" call not established and without marking, that is to say neither authorized nor refused, has a higher priority than a "B" call already established, then the "A" call must be marked as authorized.

Si deux communications ont le même niveau de priorité, alors celle exigeant le moins de bande passante est la plus prioritaire.If two calls have the same priority level, then the one requiring the least bandwidth is the highest priority.

Si le nombre de terminaux émetteurs pour les communications déjà établies et les communications autorisées est supérieur au nombre maximal de terminaux pouvant émettre simultanément dans un même bond radio, alors la communication de plus faible priorité parmi ces communications doit être marquée comme refusée.If the number of transmitting terminals for the already established communications and the authorized communications is greater than the maximum number of terminals that can transmit simultaneously in the same radio hop, then the lower priority communication among these calls must be marked as denied.

Si une communication déjà activée est marquée refusée, alors cette communication doit être interrompue.If an already activated call is marked denied, then this communication must be interrupted.

Un moteur de décision 214 reçoit comme données d'entrée les bases de données des besoins de communications 213 et des communications en cours 215, ainsi que la base des règles 216. En sortie, le moteur de décision 214 fournit au module 212 de contrôle des communications la liste des communications en cours à interrompre et la liste des communications à établir.A decision engine 214 receives as input data the databases of the communication requirements 213 and the current communications 215, as well as the base of the rules 216. At the output, the decision engine 214 supplies the control module 212 with communications the list of current calls to be interrupted and the list of calls to be made.

Enfin, un module d'administration 217 permet d'entrer et de sortir du mode de communication forte proximité.Finally, an administration module 217 makes it possible to enter and exit the close proximity communication mode.

Les paragraphes suivant détaillent la mise en oeuvre de chaque étape du procédé selon l'invention par les terminaux « maitre » 200 et « esclave » 100.The following paragraphs detail the implementation of each step of the method according to the invention by the terminals "master" 200 and "slave" 100.

Initialisationinitialization

Les opérations suivantes sont effectuées durant une phase d'initialisation des systèmes d'orchestration maitre et esclave.The following operations are performed during an initialization phase of the master and slave orchestration systems.

La description du réseau est diffusée sur tous les terminaux. Cette diffusion peut être effectuée, par exemple, en utilisant un support physique de mémoire inséré dans chaque terminal 100,200. Un paramètre de configuration, présent dans chaque terminal 100,200, indique si ce terminal est uniquement « esclave » ou s'il est également « maître ». Ce paramètre a la valeur « esclave » par défaut. Cette valeur est modifiée, via l'interface utilisateur du terminal, à la valeur « maître » pour un et un seul terminal du réseau choisi de manière aléatoire.The network description is broadcast on all terminals. This broadcast can be performed, for example, using a physical memory medium inserted in each terminal 100,200. A parameter of configuration, present in each terminal 100,200, indicates if this terminal is only "slave" or is also "master". This parameter is set to "slave" by default. This value is modified, via the terminal user interface, to the value "master" for one and only one terminal of the network chosen randomly.

Sur le terminal « maître » 200, un autre paramètre de configuration indique le nombre maximal de terminaux susceptibles d'émettre dans un même bond radio à un instant donné. Ce paramètre est nommé Nmax dans la suite du document. Sa valeur est définie en fonction des contraintes du système et de la forme d'onde support du réseau.On the "master" terminal 200, another configuration parameter indicates the maximum number of terminals capable of transmitting in the same radio hop at a given instant. This parameter is named N max in the rest of the document. Its value is defined according to the constraints of the system and the support waveform of the network.

Pour chaque service supporté par le système de communication (par exemple téléphonie, messagerie, partage de fichier, ...), un échantillon de test est mémorisé sur le terminal maître 200 lors de l'installation du service. Par exemple quelques secondes de parole pour le service de téléphonie, un texte pour le service de messagerie, etc... Cet échantillon des données à transmettre est utilisé par le module de test du réseau 111,211 selon la procédure décrite ci-dessous, dans le but de déterminer l'état de fonctionnement de chaque service.For each service supported by the communication system (for example telephony, messaging, file sharing, etc.), a test sample is stored on the master terminal 200 during the installation of the service. For example, a few seconds of speech for the telephony service, a text for the messaging service, etc. This sample of the data to be transmitted is used by the network test module 111, 211 according to the procedure described below, in the purpose of determining the operational status of each service.

Entrée en mode de communication « forte proximité »Entering "close proximity" communication mode

L'entrée en mode de communication « forte proximité » est notamment effectuée au démarrage du réseau. Le terminal maître 200 démarre avec le mode de communication « forte proximité » activé et le mode « silence radio » désactivé. Tous les autres terminaux démarrent avec le mode de communication « forte proximité » activé et le mode « silence radio » activé. L'entrée en mode de communication « forte proximité » peut également être effectuée alors que le réseau est déjà opérationnel. Ce cas de figure intervient par exemple lorsqu'un nombre important de terminaux, jusqu'alors répartis sur une zone géographique étendue, se regroupent dans une zone géographique restreinte équivalente à un même bond radio. Dans ce cas, l'entrée en mode de communication « forte proximité » est effectuée par le module d'administration 114,217.The entry into "close proximity" communication mode is notably performed at the start of the network. The master terminal 200 starts with the "strong proximity" communication mode enabled and the "silent radio" mode deactivated. All other terminals start with the "strong proximity" communication mode enabled and the "radio silence" mode activated. The entry into "close proximity" communication mode can also be performed while the network is already operational. This case occurs for example when a large number of terminals, previously spread over an extended geographical area, are grouped in a restricted geographical area equivalent to the same radio hop. In that case, the entry into "close proximity" communication mode is performed by the administration module 114,217.

Sur le terminal maître 200, la procédure suivante est lancée par une commande d'entrée en mode de communication « forte proximité ». Cette commande est par exemple invoquée depuis l'interface utilisateur du terminal maître 200. On the master terminal 200, the following procedure is initiated by an input command in "close proximity" communication mode. This command is for example invoked from the user interface of the master terminal 200.

Les bases de données des besoins de communication 213 et des communications en cours 215 sont purgées, c'est-à-dire que leur contenu est effacé.The databases of the communication requirements 213 and the ongoing communications 215 are purged, i.e., their contents are erased.

Les modules de test réseau 211 et de contrôle des communications 212 du terminal sont activés.The network test modules 211 and the communication control 212 of the terminal are activated.

Le mode silence radio du système de communication ad-hoc mobile 203 du terminal maitre 200 est désactivé.The radio silence mode of the mobile ad-hoc communication system 203 of the master terminal 200 is deactivated.

Le module d'administration 217 du terminal maître 200 diffuse à tous les terminaux du réseau une notification d'entrée en mode de communication « forte proximités.The administration module 217 of the master terminal 200 broadcasts to all the terminals of the network a communication notification in "close proximity" communication mode.

Sur chaque terminal esclave 100, la procédure suivante est exécutée sur réception d'une notification d'entrée en mode de communication « forte proximité ». On each slave terminal 100, the following procedure is executed on receipt of an entry notification in "close proximity" communication mode.

La base de données des communications à établir 113 est purgée.The database of the communications to be established 113 is purged.

Les modules de test réseau 111 et de contrôle des communications 114 du terminal sont activés.The network test modules 111 and communication control 114 of the terminal are activated.

Si le terminal 100 n'est pas également le terminal maître, le mode silence radio du système de communication ad-hoc mobile 103 du terminal maitre 200 est activé.If the terminal 100 is not also the master terminal, the radio silence mode of the mobile ad-hoc communication system 103 of the master terminal 200 is activated.

Test du réseauNetwork test

Le module de test du réseau 111,211 permet de connaître l'état de fonctionnement du réseau à un instant donné. Ce test réseau est orchestré par le terminal maître 200 de manière à limiter le nombre de terminaux pouvant émettre à un instant donné.The network test module 111, 211 makes it possible to know the operating state of the network at a given instant. This network test is orchestrated by the master terminal 200 so as to limit the number of terminals that can transmit at a given instant.

Sur le terminal maître 200, la procédure suivante est lancée depuis l'interface utilisateur du terminal maître 200. On the master terminal 200, the following procedure is started from the user interface of the master terminal 200.

Le procédé selon l'invention traite successivement chaque communauté d'intérêt présente dans la base de données 202 de description du réseau et chaque service supporté par chaque communauté d'intérêt, en effectuant au moins les opérations décrites ci-dessous.The method according to the invention successively processes each community of interest present in the network description database 202 and each service supported by each community of interest, by performing at least the operations described below.

Si le nombre de terminaux déclarés dans la communauté d'intérêt est supérieur à Nmax, alors plusieurs groupes de test sont automatiquement constitués de la manière suivante. Un terminal N1 est choisi aléatoirement parmi les terminaux déclarés dans la communauté d'intérêt. Les autres terminaux déclarés dans la communauté d'intérêt sont répartis, de manière aléatoire, en groupes de test comportant (Nmax-1 ) terminaux. Si le nombre de ces terminaux n'est pas divisible par (Nmax-1), le dernier groupe de test contiendra un nombre de terminaux inférieur à (Nmax-1). Le terminal N1 est ajouté à chaque groupe de test ainsi créé. Ce terminal N1 fait donc partie de tous les groupes de test, pour la communauté d'intérêt et le service concernés par le test. Ainsi l'intersection entre tous les groupes de test est non vide ce qui permet d'assurer une couverture complète de la procédure selon l'invention de test du réseau.If the number of terminals declared in the community of interest is greater than N max , then several test groups are automatically constituted in the following manner. An N1 terminal is randomly selected among the terminals declared in the community of interest. The other terminals declared in the community of interest are distributed, randomly, into test groups comprising (N max -1) terminals. If the number of these terminals is not divisible by (N max -1), the last test group will contain a number of terminals less than (N max -1). The terminal N1 is added to each test group thus created. This N1 terminal is therefore part of all the test groups for the community of interest and the service concerned by the test. Thus, the intersection between all the test groups is non-empty, which makes it possible to ensure complete coverage of the procedure according to the network test invention.

Si le nombre de terminaux déclarés dans la communauté d'intérêt est inférieur ou égal à Nmax, le groupe de test est identique à la communauté d'intérêt.If the number of terminals declared in the community of interest is less than or equal to N max , the test group is identical to the community of interest.

Un test du réseau est effectué pour chaque groupe de test en les considérant les uns après les autres, de la manière suivante.A test of the network is carried out for each test group by considering them one after the other, as follows.

Un message de demande de test, avec comme destinataires tous les terminaux du groupe de test est envoyé par le module de test réseau 211 du terminal maître 200. Cette demande contient un échantillon correspondant au service à tester et une valeur de temporisation. Cette valeur de temporisation est automatiquement calculée en fonction de la forme d'onde, du nombre de terminaux dans le groupe de test, et de la taille ou de la durée de l'échantillon de test.A test request message, with as recipients all the terminals of the test group is sent by the network test module 211 of the master terminal 200. This request contains a sample corresponding to the service to be tested and a timeout value. This delay value is automatically calculated according to the waveform, the number of terminals in the test group, and the size or duration of the test sample.

Le module de test réseau 211 du terminal maître 200 attend ensuite la réception de tous les comptes-rendus de test provenant de chacun des terminaux du groupe de test. Cette attente est bornée par la valeur de la temporisation Ttemp ajoutée à la durée maximale Dmax de transmission de tous les comptes-rendus de test.The network test module 211 of the master terminal 200 then waits for the reception of all the test reports from each of the terminals of the test group. This wait is limited by the value of the time delay T temp added to the maximum duration D max of transmission of all the test reports.

Le module de test réseau 211 mémorise tous les comptes-rendus de test reçus des terminaux esclaves. Lorsque l'ensemble des communautés d'intérêt et des services a été testé, le module de test réseau 211 envoie à l'utilisateur du terminal maître 200 une synthèse des résultats du test du réseau. Cette synthèse contient, pour chaque communauté d'intérêt et chaque service supporté par elle, la liste des terminaux qui apparaissent dans les comptes-rendus de test, c'est-à-dire, les terminaux pour lesquels aucun acquittement n'a été reçu.The network test module 211 stores all the test reports received from the slave terminals. When all the communities of interest and the services have been tested, the network test module 211 sends the user of the master terminal 200 a summary of the network test results. This summary contains, for each community of interest and each service supported by it, the list of terminals that appear in the test reports, that is to say, the terminals for which no acknowledgment has been received. .

Sur chaque terminal esclave 100, la procédure suivante est exécutée sur réception d'un message de demande de test. On each slave terminal 100, the following procedure is executed on receipt of a test request message.

L'adresse du terminal qui a émis le message de demande de test est mémorisée, par le module d'administration, comme étant l'adresse du terminal maître 200.The address of the terminal that sent the test request message is stored by the administration module as the address of the master terminal 200.

Si le terminal n'est pas également le terminal maître 200, le système de communication ad-hoc mobile 103 du terminal esclave 100 sort du mode silence radio.If the terminal is not also the master terminal 200, the mobile ad-hoc communication system 103 of the slave terminal 100 exits the radio silence mode.

Le terminal esclave 100 diffuse à la communauté d'intérêts J'échantillon de test reçu, précédemment transmis par le terminal maître 200.The slave terminal 100 broadcasts to the community of interest the test sample received, previously transmitted by the master terminal 200.

Il attend ensuite la période de temporisation reçue dans la demande de test. Pendant cette attente, il effectue les opérations suivantes.It then waits for the timer period received in the test request. During this wait, it performs the following operations.

Il reçoit les échantillons de test diffusés par chacun des autres terminaux du groupe de test, et envoie un message d'acquittement à chaque terminal émetteur de ces échantillons de test.It receives the test samples broadcast by each of the other terminals of the test group, and sends an acknowledgment message to each terminal transmitter of these test samples.

Il mémorise les acquittements reçus des autres terminaux.It stores the acknowledgments received from other terminals.

L'attente peut être écourtée lorsque le terminal a reçu un acquittement de la part de tous les autres terminaux destinataires de la demande de test, et qu'il a lui-même envoyé un acquittement à tous ces terminaux.The wait can be shortened when the terminal has received an acknowledgment from all other terminals of the request for test, and it has itself sent an acknowledgment to all these terminals.

Il envoie au terminal maître 200 un compte-rendu de test contenant la liste des terminaux destinataires de la demande de test pour lesquels aucun acquittement n'a été reçu.It sends to the master terminal 200 a test report containing the list of destination terminals of the test request for which no acknowledgment has been received.

Si le terminal n'est pas également le terminal maître 200, le système de communication ad-hoc mobile 103 du terminal esclave 100 réactive le mode silence radio.If the terminal is not also the master terminal 200, the mobile ad-hoc communication system 103 of the slave terminal 100 reactivates the radio silence mode.

Communications directes entre terminauxDirect communication between terminals

Le module de contrôle des communications 112,212 permet d'établir des communications entre terminaux.The communications control module 112, 212 makes it possible to establish communications between terminals.

Pour permettre ces communications, le terminal maître 200 commence par recenser les besoins de communication au sein du réseau en interrogeant chaque terminal esclave 100, puis il autorise l'établissement d'un ensemble sélectionné de communications. Ces opérations sont décrites ci-dessous.To enable these communications, the master terminal 200 begins by registering the communication requirements within the network by interrogating each slave terminal 100 and then authorizing the establishment of a selected set of communications. These operations are described below.

Sur chaque terminal esclave 100, la base de données des communications à établir 113 est mise à jour à chaque nouvelle demande de communication ou à chaque suppression d'une demande précédente. Ces demandes et ces suppressions sont requises, par exemple, par l'utilisateur du terminal esclave 100 via l'interface utilisateur, ou par un système externe via une interface informatique. On each slave terminal 100, the communications database to be established 113 is updated with each new communication request or with each deletion of a previous request. These requests and deletions are required, for example, by the user of the slave terminal 100 via the user interface, or by an external system via a computer interface.

Sur le terminal maître 200, la procédure suivante est exécutée périodiquement avec une période définie par un paramètre de configuration. Le module de contrôle des communications 212 du terminal maître 200 interroge successivement chaque terminal esclave 100 sur ses besoins de communication et mémorise les réponses dans la base de données des besoins de communication 213. On the master terminal 200, the following procedure is executed periodically with a period defined by a configuration parameter. The communications control module 212 of the master terminal 200 successively interrogates each slave terminal 100 about its communication needs and stores the responses in the communication requirements database 213.

Il détermine, par l'intermédiaire du moteur de décision 214, quelles nouvelles communications peuvent être autorisées, et quelles communications existantes doivent être interrompues.It determines, through the decision engine 214, which new communications may be allowed, and which existing communications must be interrupted.

Pour chaque nouvelle communication autorisée, il notifie l'autorisation au terminal demandeur, en précisant l'identifiant unique qui a été envoyé par le terminal demandeur.For each new authorized communication, it notifies the authorization to the calling terminal, specifying the unique identifier that was sent by the requesting terminal.

Pour chaque communication existante à interrompre, il notifie l'interruption au terminal qui avait demandé la communication, en précisant l'identifiant unique qui avait été envoyé par le terminal demandeur.For each existing communication to be interrupted, it notifies the interrupt to the terminal that had requested the communication, specifying the unique identifier that had been sent by the requesting terminal.

Il met à jour ses bases de données des besoins de communications 213 et des communications établies 215.It updates its databases of communications needs 213 and established communications.

Sur chaque terminal esclave 100, la procédure suivante est exécutée sur réception d'une demande de ses besoins de communication. On each slave terminal 100, the following procedure is executed upon receipt of a request for its communication requirements.

Si le terminal est en mode silence radio, le système de communication ad-hoc mobile 103 du terminal esclave 100 désactive le mode silence radio.If the terminal is in radio silence mode, the mobile ad-hoc communication system 103 of the slave terminal 100 deactivates the radio silence mode.

Le terminal esclave 100 répond à la demande en envoyant le contenu de la base de données des communications à établir 113.The slave terminal 100 responds to the request by sending the contents of the communications database to be established 113.

Si le terminal était auparavant en mode silence radio, le système de communication ad-hoc mobile 103 du terminal réactive le mode silence radio.If the terminal was previously in radio silence mode, the mobile ad-hoc communication system 103 of the terminal reactivates the radio silence mode.

Sur chaque terminal esclave 100, la procédure suivante est exécutée sur réception d'une notification d'autorisation pour une nouvelle communication. On each slave terminal 100, the following procedure is executed on receipt of an authorization notification for a new communication.

La nouvelle communication autorisée est supprimée de la base de données des communications à établir 113.The new authorized communication is deleted from the communications database to be established 113.

Si le terminal est en mode silence radio, le système de communication ad-hoc mobile 103 du terminal désactive le mode silence radio.If the terminal is in radio silence mode, the mobile ad-hoc communication system 103 of the terminal deactivates the radio silence mode.

Le terminal esclave 100 établit la communication.The slave terminal 100 establishes the communication.

Si cette communication est bidirectionnelle, tous les terminaux destinataires, sur réception de l'établissement de communication, demandent à leur système de communication ad-hoc mobile 103 de désactiver le mode silence radio.If this communication is bidirectional, all destination terminals, upon receipt of the communication establishment, ask their ad-hoc mobile communication system 103 to disable the radio silence mode.

En fin d'une communication bidirectionnelle, chaque terminal destinataire, sur réception de fin de communication, demande à son système de communication ad-hoc mobile de réactiver le mode silence radio sauf si le terminal a d'autres communications en cours, et sauf si le terminal est également le terminal maître 200.At the end of a bidirectional communication, each destination terminal, upon reception of end of communication, requests its mobile ad-hoc communication system to reactivate the radio silence mode unless the terminal has other communications in progress, and unless the terminal is also the master terminal 200.

Le module de contrôle des communications 112 du terminal esclave 100 notifie le terminal maître 200 de la fin de la communication en faisant référence à l'identifiant unique correspondant à cette communication.The communication control module 112 of the slave terminal 100 notifies the master terminal 200 of the end of the call by referring to the unique identifier corresponding to this communication.

Si aucune autre communication n'est en cours sur le terminal et que ce terminal n'est pas également le terminal maître 200, le module de contrôle des communications 112 demande au système de communication ad-hoc mobile 103 du terminal de réactiver le mode silence radio.If no other communication is in progress on the terminal and this terminal is not also the master terminal 200, the communications control module 112 requests the mobile ad-hoc communication system 103 of the terminal to reactivate the silent mode radio.

Sur chaque terminal esclave 100, la procédure suivante est exécutée sur réception d'une notification d'interruption d'une communication établie. On each slave terminal 100, the following procedure is executed on receipt of an interrupt notification of an established call.

Le terminal esclave 100 interrompt la communication.The slave terminal 100 interrupts the communication.

Si cette communication était bidirectionnelle, chaque terminal destinataire, sur réception de fin de communication, demande à son système de communication ad-hoc mobile 103 de désactiver le mode silence radio sauf si le terminal a d'autres communications en cours, et sauf si le terminal est également le terminal maître 200.If this communication was bidirectional, each destination terminal, on receipt of end of communication, request its mobile ad-hoc communication system 103 to disable the silent radio mode unless the terminal has other communications in progress, and unless the terminal is also the master terminal 200.

Si aucune autre communication n'est en cours sur le terminal et que ce terminal n'est pas également le terminal maître 200, le système de communication ad-hoc mobile 103 du terminal réactive le mode silence radio.If no other communication is in progress on the terminal and this terminal is not also the master terminal 200, the mobile ad-hoc communication system 103 of the terminal reactivates the radio silence mode.

Sortie du mode de communication « forte proximité »Exit communication mode "strong proximity"

Le module d'administration 114,217 permet de sortir du mode de communication forte proximité.The administration module 114,217 makes it possible to leave the close proximity communication mode.

Sur le terminal maître 200, la procédure suivante est lancée par une commande de sortie du mode de communication forte proximité. On the master terminal 200, the following procedure is initiated by an output command of the close proximity communication mode.

Les modules de test réseau 211 et de contrôle des communications 212 du terminal sont désactivés.The network test modules 211 and the communication control 212 of the terminal are deactivated.

Les bases de données des besoins de communication 213 et des communications en cours 215 sont purgées.The databases of the communication requirements 213 and the communications in progress 215 are purged.

Le module d'administration 217 du terminal maître 200 diffuse à tous les terminaux du réseau une notification de sortie du mode de communication forte proximité.The administration module 217 of the master terminal 200 broadcasts to all the terminals of the network an exit notification of the close proximity communication mode.

Sur chaque terminal esclave 100, la procédure suivante est exécutée sur réception d'une notification de sortie du mode de communication forte proximité. On each slave terminal 100, the following procedure is executed on receipt of an output notification of the close proximity communication mode.

Les modules de test réseau 11 et de contrôle des communications 112 du terminal sont désactivés.The network test modules 11 and the communication control 112 of the terminal are deactivated.

La base de données des communications à établir 113 est purgée.The database of the communications to be established 113 is purged.

Le système de communication ad-hoc mobile 103 du terminal désactive le mode silence radio.The mobile ad-hoc communication system 103 of the terminal deactivates the radio silence mode.

Claims (4)

Système de contrôle des communications au sein d'un réseau ad hoc mobile comportant une pluralité de terminaux caractérisé en ce que : o chacun desdits terminaux comporte au moins une antenne radio (104,204), un système de communication ad-hoc mobile (103,203) adapté à émettre et recevoir des données, une base de données de description du réseau (102,202) qui contient au moins l'adresse de tous les terminaux du réseau et la liste des communautés d'intérêts qui regroupent l'ensemble des terminaux susceptibles de devoir communiquer entre eux, lesdits terminaux (100, 200) comportant en plus un système d'orchestration esclave (101), o au moins un desdits terminaux (200) possède en outre la fonction maitre, lesdits terminaux maitre (200) comportant en outre un système d'orchestration maitre (201), o ledit système d'orchestration esclave (101) comportant au moins un module de test du réseau (111), un module de contrôle des communications (112), une base de données des communications à établir (113) et un module d'administration (114), o ledit système d'orchestration maitre (201) comportant au moins un module de test du réseau (211), un module de contrôle des communications (212), une base de données des besoins de communication (213), un moteur de décision (214), une base de donnée des communications en cours (215), une base de règles (216) de hiérarchisation des communications et un module d'administration (217), o ledit système d'orchestration maitre (201) étant adapté à définir quelles communications entre les terminaux esclave (100) sont autorisées en fonction desdites règles de hiérarchisation et à notifier les systèmes d'orchestration esclave (101) des terminaux esclaves (100) de leur autorisation à établir une communication ou de la nécessité d'interrompre une communication préalablement établie, lesdites règles de hiérarchisation étant établies en fonction d'au moins un des critères suivants: criticité de la communication, durée maximum Dmax de la communication, nombre maximum de terminaux pouvant émettre simultanément, bande passante disponible. System for controlling communications within a mobile ad hoc network comprising a plurality of terminals characterized in that : each of said terminals comprises at least one radio antenna (104,204), a mobile ad-hoc communication system (103,203) adapted to transmit and receive data, a network description database (102,202) which contains at least one address of all the terminals of the network and the list of communities of interest which group together all the terminals likely to have to communicate with each other, said terminals (100, 200) including in addition a slave orchestration system (101), at least one of said terminals (200) also has the master function, said master terminals (200) further comprising a master orchestration system (201), said slave orchestration system (101) comprising at least one network test module (111), a communications control module (112), a communications database to be established (113) and an administration module (114) said master orchestration system (201) comprising at least one network test module (211), a communications control module (212), a communication requirements database (213), a decision engine ( 214), a current communications database (215), a communication prioritization rule base (216) and an administration module (217), said master orchestration system (201) being adapted to define which communications between the slave terminals (100) are authorized according to said hierarchization rules and to notify the slave orchestration systems (101) of the slave terminals (100) of their authorization to establish a communication or the need to interrupt a previously established communication, said prioritization rules being established according to at least one of the following criteria: criticality of the communication, maximum duration D max of the communication, maximum number of terminals that can transmit simultaneously, band available passerby. Système selon la revendication 1 caractérisé en ce que ledit module de test du réseau (211) est adapté à exécuter, à un instant donné, une étape de test consistant au moins à : o décomposer ladite communauté d'intérêt en un nombre de groupes de tests au moins égal à un, chacun desdits groupes de tests comportant au plus un nombre de terminaux égal au nombre maximum de terminaux autorisés à communiquer simultanément, l'intersection entre tous les groupes de tests étant non vide, o envoyer depuis le terminal maitre (200) vers tous les terminaux esclaves (100) dudit groupe de test un message de demande de test contenant un échantillon du service à tester et une valeur de temporisation Ttemp, o envoyer depuis chaque terminal esclave (100), sur réception dudit message de demande de test, ledit échantillon de test à tous les terminaux de la communauté d'intérêt, o envoyer depuis chaque terminal esclave (100) dudit groupe de test, sur réception d'un échantillon de test, un message d'acquittement au terminal esclave émetteur dudit échantillon de test, o envoyer depuis chaque terminal esclave (100) dudit groupe de test vers le terminal maitre (200), avant l'expiration de la temporisation Ttemp, un compte rendu de test contenant la liste des terminaux destinataires de l'échantillon de test pour lesquels aucun acquittement n'a été reçu. System according to claim 1 characterized in that said test module of the network (211) is adapted to perform, at a given moment, a test step consisting of at least: decomposing said community of interest into a number of test groups at least equal to one, each of said test groups comprising at most a number of terminals equal to the maximum number of terminals authorized to communicate simultaneously, the intersection between all the groups of tests being non-empty, sending from the master terminal (200) to all the slave terminals (100) of said test group a test request message containing a sample of the service to be tested and a time delay value T temp , o sending from each slave terminal (100), on receipt of said test request message, said test sample to all the terminals of the community of interest, sending from each slave terminal (100) of said test group, on receipt of a test sample, an acknowledgment message to the slave terminal transmitting said test sample, sending from each slave terminal (100) of said test group to the master terminal (200), before expiry of the timer T time , a test report containing the list of the destination terminals of the test sample for which no acknowledgment was received. Procédé de contrôle des communications au sein d'un réseau ad hoc mobile comportant une pluralité de terminaux ayant la fonction esclave (100), lesdits terminaux comportant en outre un système d'orchestration esclave (101), au moins un desdits terminaux (200) possédant en outre la fonction maitre, ledit terminal maître (200) comportant en outre un système d'orchestration maître (201), ledit procédé étant caractérisé en ce qu'il comporte au moins o Une étape de détermination de quelles communications entre les terminaux esclave (100) sont autorisées en fonction de règles de hiérarchisation établies en fonction d'au moins un des critères suivants: criticité de la communication, durée maximum Dmax de la communication, nombre maximum de terminaux pouvant émettre simultanément, bande passante disponible, o Une étape de notification aux systèmes d'orchestration esclave (101) des terminaux esclaves (100) de leur autorisation à établir une communication ou de la nécessité d'interrompre une communication préalablement établie. A method of controlling communications within a mobile ad hoc network having a plurality of terminals having the slave function (100), said terminals further comprising a slave orchestration system (101), at least one of said terminals (200) further having the master function, said master terminal (200) further comprising a master orchestration system (201), said method being characterized in that it comprises at least a step of determining which communications between the slave terminals (100) are authorized according to hierarchical rules established according to at least one of the following criteria: criticality of the communication, maximum duration D max of the communication, maximum number terminals that can transmit simultaneously, available bandwidth, o A step of notifying the slave orchestration systems (101) of the slave terminals (100) of their authorization to establish a call or the need to interrupt a previously established call. Procédé selon la revendication 3 caractérisé en ce qu'il comporte en outre une étape de test, à un instant donné, des communications pour toutes les communautés d'intérêt qui regroupent l'ensemble des terminaux susceptibles de devoir communiquer entre eux, ladite étape de test consistant au moins à : o décomposer ladite communauté d'intérêt en un nombre de groupes de tests au moins égal à un, chacun desdits groupes de tests comportant au plus un nombre de terminaux égal au nombre maximum de terminaux autorisés à communiquer simultanément, l'intersection entre tous les groupes de tests étant non vide, o envoyer depuis le terminal maitre (200) vers tous les terminaux esclaves (100) dudit groupe de test un message de demande de test contenant un échantillon du service à tester et une valeur de temporisation Ttemp, o envoyer depuis chaque terminal esclave (100), sur réception dudit message de demande de test, ledit échantillon de test à tous les terminaux de la communauté d'intérêt, o envoyer depuis chaque terminal esclave (100) dudit groupe de test, sur réception d'un échantillon de test, un message d'acquittement au terminal esclave émetteur dudit échantillon de test, o envoyer depuis chaque terminal esclave (100) dudit groupe de test vers le terminal maitre (200), avant l'expiration de la temporisation Ttemp, un compte rendu de test contenant la liste des terminaux destinataires de l'échantillon de test pour lesquels aucun acquittement n'a été reçu. A method according to claim 3 characterized in that it further comprises a step of testing, at a given instant, communications for all the communities of interest which group together all the terminals likely to have to communicate with each other, said step of test consisting of at least: decomposing said community of interest into a number of test groups at least equal to one, each of said test groups comprising at most a number of terminals equal to the maximum number of terminals authorized to communicate simultaneously, the intersection between all the groups of tests being non-empty, sending from the master terminal (200) to all the slave terminals (100) of said test group a test request message containing a sample of the service to be tested and a delay value Tt emp , o sending from each slave terminal (100), on receipt of said test request message, said test sample to all the terminals of the community of interest, sending from each slave terminal (100) of said test group, on receipt of a test sample, an acknowledgment message to the slave terminal transmitting said test sample, sending from each slave terminal (100) of said test group to the master terminal (200), before expiry of the timer T time , a test report containing the list of the destination terminals of the test sample for which no acknowledgment was received.
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